Apparatus for delivering measured charges of fluid



Feb. 9 192s. 1,572,163

H. F. SHEPHERD APPARATUS FOR DELIVERING MEASURED CHARGES 0F FLUID Filed Oct. 28, 1922 s Shets-Sheet 1 IN V EN TOR.'

' ATTORNEYl H. F. SHEPHERD APPARATUS FOR DELIVERING MEASURED CHARGES 0F FLUID Filed Oct. 28, 1922 3 Sheets-Sheet 2 lNVEN TOR.

A TTORNEY.

Feb. 9 1926. 1,572,163

H. F. SHEPHERD APPARATUS FOR DELIVERING MEASURED CHARGES 0F FLUID ed ,Oct. 28, 1922 3 Sheets-Sheet 5 W zlwmll m WZ ZZZ/ 1 ATTORNEY.

Patented Feb. 9, 1926.

UNITED STATES" 1,572,163 PATENT OFFICE.

HAROLD F. SI-IEPI-IERD, OF RENO, NEVADA.

APPARATUS FOR DELIVERING MEASURED CHARGES 0F FLUID.

Application filed October 28, 1922. Serial No. 597,510.

To all whom, it may concern Be it known that I, HAROLD F. Snnrnnnn, a citizen of the United States, residing at Reno, in the county of WVashoe and State of I Nevada, have invented new and useful Iniwith a pump unit for each cylinder and each pump unit is provided with a separate adjustable connection to the governor. This is necessary on account of the tendency of the pumps to deliver slightly different quantities of the fuel according to their condition or individual peculiarities of workmanship and performance. The need of these individual adjustments for each pump unit introduces the possibility of mis-adjustment and a considerable degree of skill is required to so adjust the pumps that each cylinder receives the same quantity of oil and that the governor mechanism has the freedom of its entire range. One of the principal objects of this invention is to obviate this difliculty.

In the apparatus the delivery of fuel is divided into two functions. The fuel is measured with a measuring instrument, or pump, and delivered to force pumps, one for each cylinder. In the apparatus a single measuring device is utilized and by controlling this measuring device the fuel delivery to each cylinder is controlled.

The apparatus is illustrated in the -accompanying drawings as follows Fig. 1 shows a side elevation of an explosive engine, partly in section.

Fig. 2 a section of one of the force pumps of the engine.

Fig. 3 a side elevation of the cam mechanism actuating the force pump.

Fig. 4 a section on the line 4- 1 in Fig. 2.

Fig. 5 a central section of the measuring pump.

Fig. 6 a section on the line 66 in Fig. 5.

1 marks the engine base, 2 the engine cylinders, and 3 the fuel inlet pipes of the cylinder. The inlet pipe to the cylinder is carried into a fitting 4. Each pump has a discharge valve fitting 5 clamped between the fitting 1 and the force pump body 6. The body has a plunger cylinder 7'. in which is arranged a pump plunger 8. The plunger.

has a conical head 9 which operates against a seat 10 in the upper end of the cylinder and forms a stop limiting the downward movement of the plunger. A collar 11 is secured to the lower end of the plunger by means of a ring 12 arranged in a groove A spring 14 operates against thecollar 11 and gives: the plunger its return stroke. A lift 15 has a guide 16 operating on the collar 11 and is pivoted at its lower end on a yoke 16 which is carried bya rocker 17 The rocker has a cam roller 18 which operates on a cam19, the cam 19 beingmounted on a cam shaft 20 of the engine. The cam shaft has a cam lift 21 which forces the plunger upwardly to force a charge of fuel into a cylinder. A discharge valve 22 prevents a return flow from the pipe 3 and an inlet valve 23 prevents a return flow from the pump in the forcing stroke. These valves operate in the usual manner of valves in pumps. A test valve 24: is provided and the drainage past the plunger is caught by the guide 16 and the valve 24 and guide 16 dis charge through catch 27. v

Fuel is drawn into the cylinder 7 by way of an opening 28 and the valve 24 leads from an opening 29. These openings extend through the seat 10 and are positively closed pipes 25 and to adrip by the tapered end 9 of the plunger, th

purpose of this being to close off each forc pump from the fuel system so that a charge intended for one pump will be cut off fronr the other pumps. The cam 21 has a dweller extension 30 which holds the tapered end 9 slightly open after the forcing action and after a return movement of the plunger down to the slightly open position. During this dwell the measured charge is delivered to the pump chamber and immediately there after the roller 18 moves off the extension 30 permitting the tapered end 9 to positively close the opening 28 and all'communication to the measuring system.

The measuring pump is driven from the cam shaft 20 through a cam 31, the cam being provided with a number of lifts 32 corresponding to the number of cylinders- The cam operates on a roller 33 mounted on a rocker'34c, the rocker being mounted on the base of the engine. The rocker op crates to open the bypass valve crates a pump plunger 85 through an ad justable push pin 36'. The plunger operates in a liner 37 arranged in an opening. 38 in a body 39. The body 39 is carried by stanchions 40 extending from the base. "A fuel pipe 41 extends into a; passage 42 andpassage's 4-.3 extend from-the passage 42 to the top of the liner and a seat 44. An inlet valve in the form of a ring 45 operates on the seat 44 It will be noted that-the inlet valve surrounds the plunger a n'dthat a flange 46- on the plunger engages the valve andcloses the valve at the end of the sue-i tion: stroke of the plunger.v The flange is-i notched at 47 so as to give an overflow of; fluid;- isforce'diby a spring ea. A discharge valve is carried: by a discharge valve plug! 50 which is seated on theliner 37; A; closure plate 51 is'seateid against the-plug50 and forms a means otcommunication:with dis-.

charge passage 52. The discharge. passage leads to a bypass chamber 58 which. a pipe 54L leads to the inlet valve=-23 of the force pumps.v A bypass valve 55 operateson a seat. 56 in a plug-55K in-the' bottonr oi the chamber 53; spring 58 seats the valve. A chamber 59:- communicates with a passage 60 controlled. by the bypass valve and: a passage 61 returns the fluid bypassed to the inlet passage 42; Ar plunger 621ppl'unger is carried in anaeq ual izing lever '63,

one end of WlllC-llis connected: by a link 64:

with the-rocker 34; 'rhe opposite end of thelever is fulcrumed on: a link 6'5'exten'ding from a lever 66', this} levenbeing controlled by a governor 67 of ordinary form:

and driven by the engine. 7 p v I In the operation ot the measuring device a full charge is drawv r into the pump chamber on the downwardstroke of the plunger.. On the forced stroke of-the" plunger the charge isdelivered by the? pump through the system or passages to the force pump having the passage 10 opens, the lifts 32' of the 'cam'being timed With'the extension 30 to efi'ect this result. This chargeis modified by the Well-known bypass method. As soon as the bypass is opened some, or all,

the movement to the'pump chamber ceases- A; return movement of theplunger' bypass valve. The movement or opening of the bypass is varied by the governor changing the. tulcrum of the lever 63.

'VVhat I claim as new is 1 In a charge delivering. device, the combination of a plurality of pumps; plungers in: said: pumps having tapered ends; seats containing the inlets to the pumps closed by said tapered ends ;i a measuring device com mon to said pumps; and a cam device actuating the plungers holding the tapered: ends off its seat during the charging movement and closing the tapered ends 0111 the seat during the. charging movement of the: other pumps; i r Y 2. In a charge delivering device for ex plosive' engines, the combinationo f? a plurality oficyliinders; a forced pump:- for each cylinder comprising: a/ plunger having a tapered end thereon; a: seat operating. on the tapered end containing the inlet to the: pump; a cam device actuating the plunger and holding thesame in an intermediate position to" receive a charge; a measuring;

tapered end thereon; a seat operatingonithef tapered and containing" the: inlet to the pump a cam device actuating the plunger and holding the same in an intermediate position to receive-a: charge a measuring instrument common to said pumps comprisiing a plunger; an inlet valve around the plunger seated by the movement of the plunger on its suction stroke a bypass for varying the measured charge; and means controlling the-bypass comprisi'i'rg a governor responsive to fspeed. I

In testimony whereof I have hereunto set my hand; 4

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